I had a 92 Jaguar XJS V-12 that would have the check engine light come on (whenever I did the stupid task of washing the engine down with a garden hose). Disconnecting the battery and reconnecting it minutes later would correct the problem. That trick resets the ECU.
2009 ML350 (84K) - Family vehicle
2001 CLK430 Cabriolet (71K) - Wife's car
2005 BMW 645CI (124K) - My daily driver
2012 Mustang V6 (60K) - Daughter's car